Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.164
Publication date: 18th December 2023
The recent IPCC report emphasizes the necessity of scenarios with negative carbon dioxide emissions to meet the 1.5°C Paris Agreement goal. This underscores the vital role of negative emission technologies (NETs) in complementing comprehensive decarbonization efforts. Various NETs, such as afforestation, biochar, bioenergy with carbon capture and storage, direct air carbon capture and storage (DACS), and soil carbon sequestration, have been proposed. However, achieving COP27 goals requires a rational combination of technologies, as no single NET alone is likely to suffice. Among NETs, electrical approaches have garnered attention for their convenience, efficiency, and safety, although the electrochemical route is still in an early stage of development.
Capturing CO2 from dilute sources, including flue gas and the atmosphere, is crucial for managing global emissions and advancing downstream storage and utilization efforts. Electrochemical carbon capture methods stand out for their high energy efficiency, decentralized operation, ambient reaction conditions, and compatibility with renewable electricity.
In this context, a robust electroDAC approach with switchable electroactive adsorption materials is urgently needed. Cu-based electrochemically mediated amine regeneration (EMAR) has shown promise for controlled, reversible complexation with CO2 capture amines in aqueous solutions based on stability and performance. However, uncertainties persist regarding the precise mechanisms of Cu2+/Cu interfacial chemistry, dynamic competitive interactions at the surface and in bulk, and potential degradation routes or parasitic faradaic currents.
To address these uncertainties, we propose a reversible system using an electrostatic charge transfer mechanism at the electrode interface for energy-efficient CO2 capture and release. Our study focuses on investigating the stability and reactivity of various Cu-based catalysts under different conditions, employing spectroelectrochemical analysis to elucidate in-situ changes and interactions between adsorbed species and CO2 at the electrode interface.
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